globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13563
论文题名:
Warming of subarctic tundra increases emissions of all three important greenhouse gases – carbon dioxide, methane, and nitrous oxide
作者: Voigt C.; Lamprecht R.E.; Marushchak M.E.; Lind S.E.; Novakovskiy A.; Aurela M.; Martikainen P.J.; Biasi C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:8
起始页码: 3121
结束页码: 3138
语种: 英语
英文关键词: Arctic ; climate change ; DOC leaching ; nitrogen cycle ; OTC ; peat plateau ; permafrost ; temperature manipulation
英文摘要: Rapidly rising temperatures in the Arctic might cause a greater release of greenhouse gases (GHGs) to the atmosphere. To study the effect of warming on GHG dynamics, we deployed open-top chambers in a subarctic tundra site in Northeast European Russia. We determined carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes as well as the concentration of those gases, inorganic nitrogen (N) and dissolved organic carbon (DOC) along the soil profile. Studied tundra surfaces ranged from mineral to organic soils and from vegetated to unvegetated areas. As a result of air warming, the seasonal GHG budget of the vegetated tundra surfaces shifted from a GHG sink of −300 to −198 g CO2–eq m−2 to a source of 105 to 144 g CO2–eq m−2. At bare peat surfaces, we observed increased release of all three GHGs. While the positive warming response was dominated by CO2, we provide here the first in situ evidence of increasing N2O emissions from tundra soils with warming. Warming promoted N2O release not only from bare peat, previously identified as a strong N2O source, but also from the abundant, vegetated peat surfaces that do not emit N2O under present climate. At these surfaces, elevated temperatures had an adverse effect on plant growth, resulting in lower plant N uptake and, consequently, better N availability for soil microbes. Although the warming was limited to the soil surface and did not alter thaw depth, it increased concentrations of DOC, CO2, and CH4 in the soil down to the permafrost table. This can be attributed to downward DOC leaching, fueling microbial activity at depth. Taken together, our results emphasize the tight linkages between plant and soil processes, and different soil layers, which need to be taken into account when predicting the climate change feedback of the Arctic. © 2016 John Wiley & Sons Ltd
资助项目: The authors acknowledge financial support by the European Union FP7-ENV project PAGE21 (contract no. 282700), the Nordic Center of Excellence DEFROST, JPI Climate project COUP (decision no. 291691), the Academy of Finland project CryoN (decision no. 132045), UEF strategic funding from project FiWER, and the Nessling Foundation. C.V. received personal funding from the UEF Doctoral programme in Environmental Physics, Health and Biology as well as travel support from NordSIR, ADAPT and an STSM grant from COST Action PERGAMON (ES0902). We are grateful to Igor Marushchak, Ivan Hristoforov, and Ivan Pahonin for their immense help during fieldwork and would like to thank Tatiana Trubnikova, Hanne Säppi, and Ville Närhi for their support in laboratory analyses. Three anonymous reviewers are acknowledged for greatly improving the value of this manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60864
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, Kuopio, Finland; Institute of Biology, Komi SC UB RAS, Syktyvkar, Russian Federation; Finnish Meteorological Institute, P.O. Box 503, Helsinki, Finland

Recommended Citation:
Voigt C.,Lamprecht R.E.,Marushchak M.E.,et al. Warming of subarctic tundra increases emissions of all three important greenhouse gases – carbon dioxide, methane, and nitrous oxide[J]. Global Change Biology,2017-01-01,23(8)
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